Improvement in lathes



@1t-irrt tetra garrotv @fitta WILLIAIVI B. BEMEN T, OF PHILADELPHIA, PENNSYLVANIA. Leners Parma No. 64,938, dma May 21, 1867.

IMPROVEMENT IN LATEES.

TO ALL WHOM IT MAY CONCERN: A Y

.Be it known that I, WILLIAM B. BEMENT, of Philadelphia, Pennsylvania, have invented an improved Lathe for Turning Pulleys; and I do hereby declare the following to be a-full, clear, and exact descriptionv of the same, reference being had to the accompanying drawing,- and to the letters of reference marked thereon.

My invention consists of mechanism, fully'described hfereafter, by the aid ofwhich the peripheries of pulleys can be turned to the desired shape with great rapidity and without the necessity of resorting to the tedious adjustment and careful attention which, are demanded from skilled workmen in turning pulleys by the ordinary lathes. l l

In order to enable others skilled in the art to make and use my invention, Iwill now proceed to describe its construction and operation. On reference to the accompanying drawing, which forms a part of this specilication'- Figure 1 (drawing No. 1) is a front view of my improved lathe for turning pulleys.

Figure 2, a plain View. l

Figure, (drawing No. 2,) a transverse vertical section von the-line lf2, iig. 1.

Figure 4, a side View.` i

Similar letters refer to similar parts throughout the several views. y

A is the frame of the machine on which are formed the twov parallel Abeds a 'and a, and at right angles to the latter a third bed, b. Each of the beds a and a has a longitudinal groove, c, narrower above thanbelow, the wider portion for receiving the heads of the'bolts d and the narrower portion for the reception of a projectionv on the under side of a box, B, one box being secured to each bed by the aforesaid bolts. The boxes B B are adapted to the journals of the hollow spindle C, on each end of which is a face-plate, D,`having two or more carriers e ye, and on the spindle is fitted a detachable mandrel, f, or there may be. two mandrels f, one tted into -each end of the spindle C. The two boxes B B are connected together by the strip t, so that both may b e adjusted accurately and simultaneously on the beds a and a. On the spindle C, and forming part of the same, is a cog-wheel, F, into which gears a pinion, G, ou the shaftH, which is carried b y and is arranged-to turn in two arms I I hung loosely to hubs or projections w on the frame in which the shaft J turns, the latter being concentric with the projections. Each arm I has a projection, z', bearing-`against a segment, 7c, cast permanently on the frame, the centre of the shaft J being the centre ofthe segment. Each segment has a groove for receiving the T-head of a bolt, j, by means of which the arms L are secured after adjustment. .On the shaft J is a pinion, L, gearing into a cog-wheel, M, which is secured to the shaft J, and on the same shaft J is a cone-pulley, N, for receiving a belt, passing around a similar pulley on the counter or driving-shaft above. The opposite edges of the bed b are bevelled for the reception of the two saddle-plates P P, each of which has a recess with bevelled edges for the reception of a cross-slide, Q, and each of the latter Ahas a projection, 7i, to which is attached a guidepin or an antifriction roller, which rits snugly, but so as to move freely in a curved or angular slot -in a'plate R, the plates being secured to the front of the frame, as shown in figs. 1 and 2. to move to and fro on each slide Q, and is controlled by a screwlspindle, T, after the manner of an ordinary slide-rest, each upper slide s carrying a toch-k, which is adjustable, and is secured in the usual manner. the two slide-rests, thus constructed, one is under the control of the screw-shafts m, and the other of the screwshaft m', both shafts turning in the bed-b. Orr the ends'of the two screw-shafts, where they meet or nearlyfmeet each other, turns a pinion, n, which, has no lateral movement, but on one side of which'arc projecting teeth adapted to those of the clutch p of the screw-shafts m,vand on the otherside similar teeth adapted to a similar clutch on the screw-shaft m', the clutches beingarranged to slide freely on, but not to turn independently of their respective shafts, and being controlled by handles q, as seen in fig. 2. The pinion it receives its motion from a shaft,V, through the train of wheels, (illustratetbin iig. 3,) Athe wheels being so constructed that a change of feed can be readily made. Motion may be communicatedo this train of feed-wheels by securing a worm or tangentovheel to the shaft V, driven by a worm on a shaft at right'angles to the said shaft Y, and receiving its motion through the medium of mitre-wheels from .the shaft J, or the shaft V may be driven by a belt.

In using the machine, two pulleys are operated on at the same time, one pulley being fitted to one overhanging mandrel, and the other to the other mandrel. The two slide-rests, with their tools, are then adjusted to their proper A third slide, S', Ais arrangedl positions for commencing the cuts, the clutches p and p' are moved into gear with the pinion n, and the drivingshaft' .I is set in motion, when the operation of turning the peripheries of the pulleys is commenced, and is continued automatically by the machine. Many pulleys are rounded transversely, or have faces bcrelled from the centre towards both edges. The desired shape is imparted te the faces of the pulleys in 1ny machine by a slot in cach of the plates It. Each slide Q is controlled by this curved slot as regards the movement of the said slide from and towards thc spindle C. It will bc evident that as the slide-rests traverse the bed I) of the frame the cutting tool will not take 'adireet course in a straight line, but will traverse a course determined by that of the slots in the plate R; hencefthe desired rounded or angulaisurfaee may be imparted to the periphcricsrof the pulleys.

One of the main advantages of the machine is the facility with which the pulleys can be placed en the mandi-eis before being turned, and removed after completion, the arrangement et' the two projectingr and overhanging mandrels a'ording the greatest facilities for the speedy adjustment and removal of the pulleys, and this without stopping the machine, for one of the pulleys may bercinoved while the other is being turned. As

two pulleys can be turned at one time the machine has double the capacity ofan ordinary lathe, while the facilities afforded by the latter for adjusting or chucking the pulleysd'emand that tedious manipulation, the necessity for which my invention Was designed to obviate.

The machine can bc readily arranged to suit pulleys of dilerent diameters, all that is necessary being the loosening of the bolts d which secure the boxes B B to the beds a and a of the frame, and also loosening the bolts which secure thc arms I I to the segments It', after which the boxes B B, with the spindle C and its mandrcls, can be movedfroin or towards the slide-rests at pleasure, and secured after adjustment; the arms I I being also so adjusted that thepinien Gr may be properlyin gear with the wheel M. It will be seen, on reference to fig. 2, that each slide-rest is provided with a projection, r, which, coming in contact with the handle g, throws its clutch out of gear and arrests the further traverse of thc adjacent slide-rest. The projections r may be made adjustable so as to arrest the traverscof the slide-rest at different points. One spindle C, with its wheel, can be readily removed to make way for another spindle, having a wheel of' larger or smaller diameter, according to the power demanded by the size of the pulleys to be turned.

Although I prefer to construct the machine substantially in the manner described, it will be evident to those familiar with the manufacture of tools that many modifications may be made in the machine without departing from the main features of the invention. Without confining myself, therefore, td the precise con struction or arrangement of parts herein described, I claim as my invention, and desire'to secure by Letters Patent- Y 1. The combination ofthe spindle C, its 4two overhanging ends, driving-wheel or pulley F, and bearings B B; the whole being arrangedsubstantially as and for the purpose herein set forth.

2. The combination of thc said spindle and its two overhanging ends with the bed b carrying two slide-rests, whenthe said spindle canbe adjusted from and towards and in a direction at right angles to the said bed I);

3. The said spindle C, its adjustable bearings B B, and its cog-wheel F, in combination with the adjustable arms I I, and the gearing herein described, or its equivalent.

4. The combination of' the two slide-rests, the twol screw-shafts 1n and m for operating the said rests, the driving-pinion n, and the two clutches p an'd p.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WM. B. BEMENT.

Witnesses:

Jeux M. SnrNGLsY, WILLIAM H. CROMWELL. 

